Interest and time calculating sheet.



BiEOIMENEL APPLICATION FILED AUG. 5, 1908.

Patented July 13, 1909.

2 SHEETS-11331 1.

TO FIND THE NUMBER OF DAYS BETWEEN ANY TWO GIVEN DATES IN THE SAME YEAR:Toke Hlediffevence ne-nueen +he accom oymg index numbers.

If +he given dams ave 1n differenf buf ConSBCuffve yeaYs, flake,+hed1ffl1rindex numbers 0110! subrracf H115 YesuH' from ence behueanrhaaccompunymg 365. I11 leap ear, 1? H12 period mvolvcs February 29111, addone day +orhe YCSUH in each case.

TU FIND THE DATE OF MATURITY IN THE SAME YEAR Add 1'0 H'le Index vlumbeYF 1hr: given da-ie +112 number ofdays rerun. The, "resuH will be+hemclcx of Hm requ weci (10175. I

If The Yequived dn-la 1's in fhe followmg year: Add *0 H11; molex numberof '11: g'wen dafe fhe number of days 1'0 run and subh'ucr 365 From+1115 result In leap year 1f H16 perlod mvolves February 9141. Subfram"one 111 each case,

1505 1111115 TENS DAYS UNITS 4 .3 2 I 9 B 7 (a .7 4 5 1! l 9 0 7 6 5 A 32 D8 07 D5 03 O2 1 02 0| 01 01 0| 0| 0| 1 J 4 J 2 1 s a '7 1a 5 4 3 2 1s a 7 1! 5 4 3 2 1 117131011103 2 030302020201011 2 .5 4 3 2. 1 9 a 7 1,5 4 a z 1 a a 7 a 4 J 2 I 25211151005 5 05041140303020201015 .5 4" 3 a 1s a 7 1' 5 4 5 2 1 a a 1 1, 1r 4 a a 1 33 27 211 15 07 01 05 05 04 03 0302 01- 01 4 01 01 8 3 2 1 a a v 1, a" 4 a .z 1 9 a 1 1. .5 4 a 2. 1 42as 125 17 015 5 0e 07 01, 05 04 0a 03 0a 01 5 01 01 0101 5 4 a z 1 9 a 7a 5 4 3 a 1 a a '1 a 5 4 3 z 1 .50 51 2o 10 0905 07 01,115 0/1 03 02 016 0101010101- 5 4 3 1 I r! 9 8 7 6 5 a 3 2 I 9 8 7 6 5 4 3 2 1 5B 4'/ 2312 11 09 00 07 011 05 0.1 02 01 7 01 010101 01 5 1 3 2 1 9 B 7 s 5 4 3 z1 2 8 7 6 a 3 2 1 e7 53 110 2713 f) 1211 09 013 07 05 041113 01 6)010101010101 5 4 3 2 1 5 8 'l b 5 4- 3 Z. I 9 8 7 6 5 4- 3 2 I 75 190 4530 as 9 111 12 11 0a 0a 01, 05 0a 02 9 01 01 01 01 01 01 S A 3 2 1 9 B 76 J 4 3 .1 I 9 8 7 b 5 4- 3 z I 57 -51) 651 17 10 15 13 1210 05 07 05 0302 oz 01 01 01 01 01 01 3 z 1 9 a 'l a J 4 a 2 1 1 9 8 'I 6 5 4 3 2 1 92as 55 3'1 1e 11 17 1513 11 09 11701, 01102 1 02 010101 0101111 5' 4 a 21 2 9 e, '7 1, a 4 a 2 1 12 a a 7 1, 5 4 a 1 1 1110 50 0,0 40 20 i 1611,111 1210 0a 1119 04 oz 02 02 010101 01 01 5 11 3 a 1 s e 7 e1 5 4 5 21 s e 7 1. J 4- 3 2 1 10a 87 215 411 22 1 20171513 11 09 0'1 011 02 1302 02 112 01 0101 01 5 4 3 a 1 s s '7 e 5 4 a z 1 9 o 7 1, 5 11 3 2 1117 95 47 23 21 19 161412 09 07 05 02 02 02 02 01 01 0101 11' A .3 2 1 5a 7 1, f 4 3 2 I 9 6 7 1, J 4 3 2 1 125 1110 51 25 i5 23 20 1s 15 13100a 05 b5 15 02 oz 02 02 01 01 01 111 J 4 3 z 1 9 6 7 b 5 4- 3 2 9 6 '7 1a 4 3 2 1 13:1 11171311 as 21 i6 24 21191613 05 0s 03 i6 02 11a 020201010101 5 4 .1 p. 1 s a 7 s 5 4 3 2 1 9 a 7 1 r 4 a a 1 1112113 65 57as 17 2e 23 2017 1 111 0s 01, 03 17 03 02 02 11;: 01010101 5 4 6 2 1 s e7 a J 4 J 2. 1 s 5 7 g, 5 4. 3 z 1 150120 60 50 i6 27 2421 161512 09 0e05 i5 0a 02 02 02 oz 0101111 q a" a 3 z 1 9 a 1 a 5 4 3 z 1 9 a 7 1, 5 4s 2 1561211 e3 :12 s 29 25 22 19 1e 13 10 0e 03 19 0a 0a oz 02 02 01 01a1 @fluzntoz Egg}, WaH'eY Sparhlm wince/.19

UNTTED PATENT @FEJLQE.

WALTER SPARKLIN, OF PETERSBURG, VIRGINIA.

IN TE'RESTAND TIME CALCULATING SHEET.

Specification of Letters Patent.

Patented July 13, 1909.

To atiwhom it may concern:

lie it known that L-Vhuxrnn Smmnan, a citizen of the United States,residing at letersburg, in thecounty of Dinwiddie and State of Virginia,have invented new and useful lmprt'ivements in Interest and TimeCalculating Sheets, of which the following is a specification. 7

This invention pertains to interest calculating sheets and has for itspurpose the provision of such a table whereby interest may be readilycomputed upon a given amount for a given period.

The further object of the invent-ion is to so arrange the indicia that acomplete calculation may be made While the sheet is held ctnivenieutlyin view; and to accomplish this result without the use of mechani fillmeans. such as slide rules, pointers, etc... that are usually employedon de\ices for this purpose.

Other advantages attending the use of my interest calculator are that itotters the shortest, simplest, most accurate and practical method ofcomputing interest. it especially adapted for use in connection. withthe adjustable coupon certificate ot deposit, a modern banking devicefor time deposits, the use of which increases deposits by otter mg largeinducements to depositors, makes more business with less labor and cost,simplifies the bookkeeping and reduces it to the minimum, therebypractically eliminat lug-errors and dishonesty among employees. andmakes hanking-by-mail easy. I li'ith these and subordinate advantageshereinafter explained my invention embodies the arrangement anddisposition of dat: shownon the .wconipanying sheet, the details ofwhich ..e pointed out in the follow mg spec.ific:-1tion and set forth inthe claims. in the fac-simile submitted, Figures '1. and 2, designatethe sheet in its entirety, disclosing the system.

Since the data shown on Fig. 2 is merely e calendar continuation andcomputations ereifor of that shown'on Fig. 1, it. will be. necessary todescribe in detail only Fig. 1. In this view A refers to the tablehaving four decimal sect-ions or colmnns headed Thousands Hundreds,Tens, and Units, running from left to right and indicat ed by B, (j l),and 1*], respectively. In the left hand or thousands stx'ftion are ten(10) vertical sub-columns F, intersected by horizontal columns 1*providing blocks, in which are inserted. in black figures as at. a,various numbers, indicating the amount of interest for various numbersof days, and at the heads of these columns and above each of the blacknumbers referred to, are the primary digits in red 6, denoting thenumber of thousands; i. e. in the first or left hand column, over eachnumber in black, is the number 10 in red, indicating that the numbers inblack show the interest on $10000 for the various numbers of daysconsecutively. In the sec. ond suh-column of the section B, over eachnumber in black, is the figure 9 in red, indicating that the numbers inblack give the interest on $0,000 for the respective number of days. iIn like manner, each subcolumn in this section, represents the interestontho number of thousands, shown by the red figures in that column. Thesecond, or hundreds section C, has nine sub-columns, similarly arranged,and indicatingthe interest on hundreds from nine to one re spectively.The-third or tens section D, bears a like relation to the interest ontons of dollars, and similarly, the last or units section, shows theinterest on dollars. Between these several sections B, C, D, and E, andto the left of the. thousands section 13, are columns G having figures 0in black but: of larger size than those heretofore mentioned, whichfigures indicate the number of days,on the face of the card A (Fig. 1)from '1 to (30, and on the back of the card (Fig. 2) from 61 to 123,thus making calculation available by this method, for a period of anyfour months. The method of ascertaining the interest by the use of thiscard is shown in the following illustrationz- Required-the interest 011$7,984 for 51 days, 0%.

In the days column, near the left, find 51. Follow the line of thisnumber continuously to the right.

Under 7000 you will find $59.

By simple addition you find that the interest on $7984. for 51 days is$67.80.

A separate card is provided for each rate of interest and by the use ofthe proper card, according to the required rate, the interest. of anyamount up to $10,000, and for any time up to 123 days, can be formedalmost instantly. This interest computing card is primarily intended fruse in connection with the adjustable coupon certificate of deposit;system wherein for instance there are three interest dates in the year,namely May lst, September 1st, andlJan. 1st, but it may just as readilybe adapted to a four per cent. rate of interest with the interest dateson Jan. lst, .tpril 1st, July 1st, and Oct. 1st. For the purpose ofdetermining the number oi days for which the interest is desired, thereis arranged on the left hand margin of the table A a time schedule llconsisting of three columns (Z, c and f, entitled Time to next interestdate the three colmnns themselves-being subrtitled May 1st, September1st. and Jan. 1st, and under these sub-titles are given in black as at 7their preceding dates in inverse order. Thus the left hand column (I.headed May 1st, reads Apr. 30tli.29tli, 528th, :tc. Suppose it shall bedesired, on April 3rd, to ascertain the nmnber oii' dags to the nextinterest date: Find Apr. 3rd in this schedule and take the correspondingnumber in the days column G, immediately at the right of this schedule,which, in this instance, is 28, showing that on Apr. 3rd interest to thenext date must be reckoned tor twenty-eight days.

To further extend the usefulness of this system to ordinary banking andgeneral accounting, the days of the year are given in this schedule inred figures at 71., in eonnection with the days of the respectivemonths; thus the 12th day of April is shown at [8 by the red numberimmediately above to be the [02nd day of the year, therefore, todetermine the. number of days between any two dates, it is necessaryonly to take the (litterence betwetai the accontpanying numbes in red,which are termed the intlex nun'ibers. And to determine the ,maturi y ofa note, with given date, at so many days, it is necessary only to add tothe index number of the date of the note, the number of days the notehas to run, and the result will be the index (iii the retntired date. Ofcourse, in leap year, accom'it must be taken of the 29th ofFclnruary;-and also when the periods run over from one year to the next,allowance should be made for the difference of the days in the year.Thus if the required date is in the following I number the number ofdaysto run and subtract 305 from this result. In leap year, it the periodinvolves Feb. 29th. subtract one.

Having thus set forth the purpose of my invention and detailed itsmethod of use, what is claimed as new is:

1. .lna system for computing interest, a.

table divided into sections containing interest amounts and indiccolumns adjacent said sections, and a time schedule column sub-dividedinto a. plurality of monthly columns, the dates of themonth alined withyear, add to, the index a therefor. day;

therein alining with the numbers in the day columns whereby interveningtime between interest periods may be determined.

2. In a system for computing interest, a table containing interestamounts and indicia therefor, a day column having indicia thecorresponding interest amounts in the table. and a time schedule dividedinto a plurality of monthly columns having the dates thereofarranged ininverse order, said dates having associated therewith indiciadesignating the year dates of the several days whereby interestcalculations may be made upon said table.

3. In a system tor computing interest, a table divided into decimalsections, said sections subdivided into. columns containing the primarydigits, said digits having associated ther with amounts representinginterest, a day column having indicia alincd with thecorrespondinginterest amounts in he. table, and indicia for determiningthe dates of maturity thereof.

4-. in a system for computing interest, a table divided into decimalsections, said sections sub-divided 'into columns containing amountsrepresenting interest, the primary digits heading said interest columns,and a time schedule column, a day column having indicial alincd with thecorresponding interest amounts, adjacent said sections whereby interestcalculations may be determined.

5. In a system for computing interest, a table divided into decimalsections, said sections sub-divided into columns c'ontaining the primarydigits, said digits having as7 sociated therewith amounts representinginterest, a time schedule column adjacent said sections, said columndivided into monthly periods. and day columns internu'diate saidsections and adjacent the schedule column whereby the number ol" days tothe next interest period may be determined.

(3. In a system for computing interest, a, table divided into decimalsections, said sections, subalividcd into columns contaii'iingthetprimary digits, said digits having associated therewith amountsrepresenting in-' terest, and a time schedule column adjacent saidsections, said schedule column being sub-divided into a plurality ofmonthly columns having the dates of said months arranged in inverseorder. said dates having 'associated therewith numbers designating theyear dates thereof, whereby the number of days between given dates maybe computed for calculating interest.

in testimony whereof I have hereunto set my hand in presence of twosubscribing wit nesscs. I

UH/FER- SPARKLTN. W itncsses:

.\'l. H. limo, \V. L. Youno.

